Pathogenic Role of Human Herpesvirus 6B Infection in Mesial Temporal Lobe Epilepsy

Yoshiki Kawamura, Ai Nakayama, Taichi Kato, Hiroki Miura, Naoko Ishihara, Masaru Ihira, Yukitoshi Takahashi, Kazumi Matsuda, Tetsushi Yoshikawa

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Human herpesvirus 6B (HHV-6B) is the causative agent for exanthem subitum. HHV-6B was associated with mesial temporal sclerosis (MTS), leading to mesial temporal lobe epilepsy (MTLE). In this study, we sought to elucidate the pathogenic role of HHV-6B in patients with MTLE. Methods. Seventy-five intractable MTLE patients, including 52 MTS patients and 23 non-MTS patients, were enrolled in this study. Resected hippocampus, amygdala, and mixed samples of amygdala and uncus samples were examined by real-time polymerase chain reaction (PCR) and reverse-transcriptase PCR to detect viral DNA and messenger RNA (mRNA), respectively. Host gene expressions, including neural markers, were measured using the TaqMan Gene Expression Assay. Results. Detection of HHV-6 DNA was higher in MTS patients than non-MTS patients (median/interquartile range: 19.1/0-89.2 vs 0.0/0.0-0.0 copies/μg DNA; P = .004). HHV-6B viral DNA was determined in 12/27 HHV-6 DNA-positive samples, and no HHV-6B mRNA were detected in all samples. In MTS patients, expression of monocyte chemotactic protein-1 (P = .029) and glial fibrillary acidic protein (P = .043) were significantly higher in the amygdala samples with HHV-6 DNA than those without viral DNA. Conclusions. This study suggests that HHV-6B may play an important role in the pathogenesis of MTS via modification of host gene expression.

Original languageEnglish
Pages (from-to)1014-1021
Number of pages8
JournalJournal of Infectious Diseases
Volume212
Issue number7
DOIs
Publication statusPublished - 01-10-2015

All Science Journal Classification (ASJC) codes

  • Immunology and Allergy
  • Infectious Diseases

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